Regex Tester - Free Online | ToolXHub
Use Regex Tester online for free, no download required. ToolXHub offers hundreds of fun online tools.
About this tool
Regex Tester is a free online developer tool. Test regular expressions online with match highlighting. Built for coders and engineers who want less friction. It runs entirely in your browser — no download or sign-up needed.
After opening the page, enter the rule expression and test the text, and the tool will immediately display the matching results. Matching sections will be highlighted in different colors and capture groups will be listed separately. General syntax differences in different languages (such as JavaScript, Python, and Java) are supported, and you can switch regular engines to test compatibility.
The tool is based on a browser-native RegExp object implementation and uses the exec method to loop through all matches. For complex regex (such as backreferences, zero-width assertions), detailed matching procedures and backtracking information are displayed. Some tools also provide regular syntax highlighting and error prompts.
It is suitable for developers to debug regular expressions and verify whether complex patterns are correct. It's more efficient than repeating tests in code, where you can visually see matching results and capture group content.
Regular expression online testing tool that verifies regular matching results in real time, supports multiple regular grammars, and visually highlights matching content and capture groups.